Cylinder grinder



3 Sheets-Sheet 2.

lill Gea y Jan. 31, 1928.

G. A. GOU LD CYLINDER GRINDER Filed DSG. 18, 1922 Patented Jan. 31, 1928.

UNITED STATES GEORGE A. GoULn, or SCHENECTADY, New venir.v

CYLINDER GRINDER.

Application filed December 18, 1922. Serial No. 607,515.

The present invention relates tomachines or mechanism for grinding or .finishing the surfaces of cylinders,` particularly the cylinders in internal combustion engines, used in automobiles, tractors, power boats and other like and similar apparatus., l

Among the objects of the invention is to provide a grinding `mechanism of light weight, small volume, and being easily carried about and attached to the cylinder block of the engine fo-rgrinding out the cylinder, or otherwise operating thereon; to make the same with the operating 'parts in a slidable column and movable with the column, whereby increased rigidity may be obtained as the grinding member is caused to enter more or less into the cylinder; to provide a standard with operating parts ,atits upper end which do not move with the operating partsV connected to the column; to provide means, such as centering rings, aligning the grinding mechanism or centering it with respect to the axis of the cylinder to be ground when setting up the apparatus; to provide for driving ineans, such as spiral gears, for driving `the grinding spindle from theldriving shaft, whereby a very smooth, andtuniform'grinding operation may be obtained without chattering or vibration; to construct a gear head, with eccentric spindle bearing means, Which may permit the adjustment of the grinder to make a more or less deep, or slight cut, in the cylinder wall, as desired, together with suitable means for adjusting the saine at will; to provide a support for the column in the operating mechanism which may be rigidly secured to the cylinder block in adjusted position, and which will also permit ready access to the interior 0f the support and the cylinder, as well as permit a visibility of the operation, undergoing way; to malte the operating mechanism of extensible sections, of which one setis rotatably mounted in the stationery upper end of a standard rigidly fastened to the support and the other set n'iovable withthe column to a greater or less depth in the cylinder; to provide for the use of a number of centering rings, each ofY which have an outside diameter to lit the particular cylinder to be ground, and having an internal diameter tol-lt a part of the operating mechanism; to provide for mount-` ing the grinder spindle in a bearing that is rotatably mounted in the head of the mechanism eccentrically with respect to the axis of the column, and connecting the-spindle with the driving shaft by gears, preferably spiral gears, including an elongated spiral gear acting as an idler whose axis is coincident with the axis of the rotatable bearings, so that the gear `on the spindle may be made to move about the axis of the idler without disengaging from the idler gear; and such further objects, advantages, and capabilities as willv later more fully appear, and are inherently possessed by the invention.

In the diawing illustrating the preferred form of the` invention, Fig. 1 is a View in side elevation of an assembled grinding mechanism connected to the cylinder to be ground, the cylinder being shown in verticalsection; Fig. 2 is a fragmentary view in elevation of the drive between the motor and theupper partvof the mechanism; Fig. 3 is a vertical sectional viewtaken through the apparatus and a cylinder to be ground; Fig. t is a like view showing the mechanism ingoperation with the grinder extending into the cylinder', Fig. 5 is an enlarged detail sectional view of the lower end of the grinding mechanism, showing in detail the driving gears between the driving shaft and the grinder spindle; Fig. 6 is a horizontal sectional view taken von line 6--6 of F ig. 4 of the drawing; and, Figs. 7 8, and 9, are, respectively, horizontal'views taken on lines 7-'., 8 8 and 9`9 of Fig. 5 of the drawing.

Referring'more in detail to the drawing,

the invention is shown in connection with a cylinder l, theinterior surface of which is to be ground. After the cylinder cap is removed, the apparatus, which is readily portable, may belocated upon the cylinder block by locating the same overthe opening of the cylinder. The mechanism comprises, generally, a support or supporting member :2, having two or more vlegs 3 provided at their `lower ends with feet or flanges l-. In the supporting member 2 is vertically, Vslidably, supported or mounted, a cylindrical column 5 having on its outer surface a rack 6 with which engages a pinion 7 fast with a spindle 8 rotatably mounted in a boss 9 integralwith the support 2,-'-see Fig. 6 of the drawing. To an end of the spindle 8 is fastened a hand wheel l0 by which the pinion 7 may be rotated to cause the column'l to be l lowered or raised as required.

of the cylinder to beground, a centering place,

drawing.

ring 11 is used. There are a series of rings for fitting different size cylinders and among such rings may be selected the one fitting the particular size cylinder to beground, and the same is connected to a head 12 vof the grinding mechanism. vWith the ring 11 in as shown in Fig. 1 of the drawing, the hand wheel 11 is operated to lower the column 5 and the mechanism carried thereby, until theV ring 11fenters into the cylinder 1, thus determining the proper location or relationof the support 2. With the latter properly centered, the same is clamped or rigidly securedfin place by means of dogs 13, extending over the liange a of each leg 3 of the support, and apertured to receive the stud bolt 111, forming a fixed part ofthe cylinder block, the nuts 15 being turned or tightened in place to securely hold the dogs against the flanges 4. When the support 2 has thus been centered the operating Vhandle 10 may'again be operated to raise the column, and owing to the space provided between the legs of the support, .the ring 11 may new be removed from the head 12, when the grinding mechanism will be ready for operation. y

lVithin the cylinder 1 is rotatablymounted or supported a feed member 16, preferably of cylindrical form, and having secured at its lower end, preferably by a thread 17, the head 12. It will therefore be noted that the member 5 and the head 12 act together as a unit, both for rotary and vertical movements. An elongated clearance space 18 may beprovided between the inner portion of the column 5 and the outer surface of the member 16, for facilitating the rotating of the member 16 in the column 5, as well as providing for a space for a lubricant. Further-` more, for the purpose of reducing the friction between these members, ball bearings 19 ymay `be provided between the lower end of the column 5 and the upper portion of the,

head 12, as clearly shown in Fig. 5 of the drawing. To the member 16 is suitably splined a telescopic member 20, with its upper end rotatably supported or mounted in the shelf portion 21 of a standard 22 rigidly connected, as by means of screws 23, at its lower end, to the supporting member 2, as clearly shown inV Figs. 3, 11 and 6 of the The lower extreme end of the standard 22 is preferably provided with a laterally extending table 24, upon which may be supported a driving motor 25, suitably connected with driving elements,.as will more fully hereinafter appear. It will lthus be seen that the members 16 and 20 formtogether a telescopic unit of two sections.v

splined together so that they may rotate 1n unison, but that the member 16 is capable of sliding vertically with respect to the member. 2() when thel column 5 is adjusted to project the grinder more or less within the cylinder to be ground. Fig. 3 of the drawing shows the parts when they are in full nestedposition, and Fig. 4; of the drawing shows the same parts in partly extended position. 'lo the upper end of the member 2() is suitably secured or fastened a large diameter` pulley 26, over which operates a belt 27 passing over idler pulleys 28, rotatably supported in the upper end portion of the standard 22. rlhe belt 27 passes downwardly over a small pulley 29 rigid with a larger pulley 30, both rotatably mounted upon a stud 3l forming a rigid part of the standard 22, a thrust nut threaded on the end of the stud 31, serving to hold the pulleys 29 and 30 in position on the stud. From the pulley 30 passes a belt 33, over a small pulley 34; fastened to the shaft 35 of the motor 25. It will thus be apparent that the members 20, 16, and the head 12 will beirotated at a relatively slow speed by the motor 25. The purpose of this drive is to carry the grinder around the cylinder, as the same is caused to operate upon the inner surface of the cylinder. lt will appear more clearly hereinafter.

Within the members 20 and 16 is rotatively included a sectional shaft having a lower solid section 36, rotatively supported yat its lower end in a bearing 37, provided in the upper end of the head 12, as clearly shown in Fig. 5, of the drawing. r1`he upper end port-ion of the shaft- 16 slides in a tubular section 38 having its upper end rotatively` received in a bearing 39 formed in the upper end of the member 20. Both shaft sections and 38 are splined to permit longitudinal relative movement of the sections, but to make them rotate in unison. It willthus be apparent that the section 36 is vertically slidable with the members 16 and 5 when the grinder loweredl or raised in the cylinder. The section 38 will remain in its stationary position, with the exception ofits rotating in the bearing 39, as will appear morel clearly hereinafter. At the upper end of the member 3S is lfastened or secured in any suitable manncr, a relatively small pulley 40, over which passes a belt 4-1 passing over idlers 12, rotatively supported in the upper portion of the standard 'lhe belt 41Y passes downwardly to a large pulley 43, lixed to the armature shaft 35, of the motor 25. In this way it will be noted that by using a large pulley 43 and a small pulley 40, the motor is capable of driving the central shaft 3638 of the grinding mechanism at high speed, the'purpose being for driving the rotary cutter or abrasive member in the cylinder at grinding velocity, as the same is,

Iii

#al form, having itsupper portion secured to the lower end of the member 16 as by threads 17. In the lower end portion of the head l2 is rotatably mounted acylindrical bearing member 44, having its axis to one side'ofthe axis of the head 12, or shaft section 86, or, in other words, being located eccentrically. with respect to the axis of the shaft 38 of the grinding mechanism' as a whole. ln. the bearing member 44 is rotatably supported a grinder spindle 45, having its axis eccentric toutl'ie raxis of the bearing member 44, and at a distance from the axis of the member 44, such that the axis of the spindle 45 may be co-axial with the -axis of the shaft section 36, in one position of the spindle 45 and bearing member 44, as shown in Fig. 5 of the drawing. The periphery of the member 44 is provided with worm gear teeth 46, withwhich engages a worm screw 47, rotatablysupported, in a suitable manner, in a socket provided transversely in the head l2. This is clearly shown in Fig. 9 of the drawing. One `end of the worm 47 has a thrustshank 48, extending tlirough a bearing `portion 49 of the head l2, and has connected at the end of the shank a. nut 50, as shown in Fig. 9 of the drawing. The other end of the worm screw has a polygonal socket, preferably square, to receive a socket wrench, whereby the worm screw may be ro tated as desired. ,It-*will be noted that the end portion 52 of the worm screw is wholly enclosed within .the transverse socket ofthe head l2 so that lit will not protrude beyond the outer surface of the head 12. It will be apparent that, as the worm screw 47 is rotated in one directionor the other, the bearing member 44 willbe-caused to rotate about its central vertical axis, as clearly shown in Figs. 5 and 9 of the drawing. At the lower end ef the spindle 45 is suitably secureda grinding or abrasive member 53, preferably i of disc form, the periphery of vwhich maybe brought into contact with the interior surface of the cylinder l,for the purpose of removing material or polishingr it, depend- Y ing upon the work to be performed.

At the lower end of the shaft section 36 and the upper end of the spindle 45 ai'e respectively secured, or otherwise suitably fastened, spiral pinions 54 and 55, but it will be noted that these pinions are Vnot in mesh with each other, but are located, one beneath the other, that is, the pinion 55 is below the pinion 54 and spaced slightly therefrom. It will also be noted that when the member 44 is` rotated in one position, the pinion 55 is directly below the pinion 54. At on side of'these pinions is rotatably supported an idler spiral pinion 56 which is preferably elongated and is also in mesh with both pinions 54 and 56, as clearly shown inrFigs. 5,

7 and 8i: of the drawing. The pinion 56 has trunnions 57 and 58 at the ends thereof and ypath above the axis of the pinion iis rotatably supported in bearing sockets provided in the upper part of the head 12, and in the bearing member 44. The axis of the pinion 56 is coaxial with the central axis of the bearing member 44. From this construction it will be observed that the pinion 54 drives they pinion 56, which in turn will drive the pinion 55, and by reason 4of the latter being fixed to the spindle.45, will drive the spindle and the grinding wheel53.

Moreover, by reason of this particular construction, it will also be apparent, that the beai'ingfmember 44 may be rotated, as desired, carrying with it the spindle 45 and the gear or pinion 55. Assuming, in the first place, that the spindle 45 is co-axial with the shaft section 36, which is the innermost position of the spindle 45 and grinding wheel 53, the spiral pinion 55 will be located directly beneath the pinion` 54, as shown in Fig. 7 of the drawing. After the column has been moved downwardly so as to carry the head l2 and the grinding wheel 53 into the cylinder l, the bearing member 44 may be rotated so as to carry thespindle 45, gear 55 and the grinding wheel about the central axis of the member 44, so as to causethe grinding wheel 53 to move away from the central axis of the grinding mechanism, that is, the axis of the head 12 andA shaft section 36. This operation-may be continued until the grinding wheel 53 contacts with the interior surface of the cylinderv l. After the grinding wheel has been fed outwardly to the proper cutting gear 55 will probably have the position shown in dotted lines in Fig. 8, the gear 55, and spindle 45 having been moved fromthe full line position of the gear 55 to the dotted line position of the same, as shown by the arrow in F ig. 8 of the drawing. The new position of the grinding wheel 53 will be shown in dotted line Fig. 9 of the drawing. It will be noted that duringthis movement, inasmuch as the pinion moves in an arch 56, the gear 55 will remain constantly in mesh with the gear 56, although the same may be rotating about its own axis at the saine time. Duringy the operation of the device, the motor drives the central shaft 236-38 at a high speed, and hence the rotating cut-ter 53 operates at a very high speed against the inner surface of the cylinder l. At the same time the motor also drives the feed member 16.*2() at slow speed, thus rotating the head l2, and inasmuch as the latter carries the bearing member 44 and the driving mechanism between the shaft section 36 and the spindle 45, the head l2vis rotated in a circle about the axis thereof or the axis vof the shaft section 36, which is also the central axis of the grinding mechanism in general, and the rotating cutter 53 is carried around in distance, the

luf;

the cylinder inthe path of a circle, while the cutter 53 is rotating about its own axis to perform the grinding operation upon the cylinder surface. In this way it will be observed ithat the members 16 and 20 driven at a slow rate, constitute a feeding mechanism for feeding the rotary cutter varound theinside ot the cylinder while the vcutter is operating on the surface of the cylinder. In this way a perfectly circular or cylindrical inner surface ot the cylinder' will be obtained. 1

By making the rotating members ot the mechanism within the column of telescopic sec-tions, the upper sections thereof maybe held in stationary position while the column t'or the other section may be lowered to a greater or less extent as required tor the purpose ot' grinding the length ot the cylinders. By moving the column as a whole, together with the other elements included therein, and by reason ot the column havingfa large diameter, it enures tothe rigidity ot' the apparatus so that a heavy eut may be taken with the cutter or grinding wheel 53 without flexing the supporting member thereof. Or dinarily, when the driving shaft carrying the grinding wheel is the only member that nieves from its bearing support, a slight lateral pressure or resistance against the grinding wheel Vwill cause the drivingl shaft to llcx orlbend, and consequently a correct and perfect grindingof the .cylinder cannot be obtained. y By having the rotating members litting closely within the column, which is slidably adjustable in the supporting member, greaterrigidity is obtained, anda greater depth of cut can be effected, to the end ot reducing work or finishing a job in much shorter and more convenient time.v

Vv'hile l have herein described and shown upon the drawings a preferred embodiment ot my invention, it is to be understood that the invention is not limited to the particular construction, arrangements and details ot parts shown and described, but that other constructions, details and arrangements of parts are comprehended by the invention without departin from the spirit thereof.

Having now @scribed `my invention I claim i l. In a machine for grinding cylinders, the combination of a support, a column adjustably mounted in the support, a carrier member rotatably mounted in the column, and movable therewith when the column is adjusted, a head member secured to the lower end of the carrier member, a driving shaft rotatably and concentrically mounted in said head, a bearing member rotatably and eccentrically mounted in said head, a grinder spindle rotatablymounted in said bearing, means 'for rotating the bearing whereby the spindle is moved to and from the axis yof the head tor decreasing and increasing the cut of the grind in the cylinder walh'and means connecting the shaft and spindle whereby the latter' is driven by the former, and means for operating the shaft and carrier member'. y

2. In a mechanism for grinding cylinders, the combination ot aisupport, a standard rigid with the support and extending up wardly above the support, -a column mounted in the support, means for slidably adj usting the column in the support, a pair of splined members rotatably mounted respectively in the column and the upper end ot the standard whereby the member in the column moves when the column is adjusted, a grinder carrying head fastened to the lower end or' the member in the column, a pair ot' splined shaft sections rotatably mounted in said head and the upper end of said standard, means in said head for driving the grinder from the shaft in any position ot' the grinder and means at the upper end of the standard for operating the splined members and shaft sections.

In witness whereof, I hereunto subscribe my name to this specification.

GEORGE A.. GOULD. 

